Add an eval function on Preprocessing Builtin functions

Question

Hello PlantUML team,

• Could you add on Preprocessing Builtin functions an eval function?
  in order to Convert a String to an expression.

Like:

:%eval("1 + 2");

[See on PlantUML...]

Regards,
Th.

Comments

Hello PlantUML team,

Researching a workaround, to eval the string "1+2", I discover this solution:

@startuml
!procedure proc($arg)
  $arg
  :$r;
!end procedure

proc("!$r=1+2")
@enduml

Nevertheless, it is not direct: it needs that the preproc runs more one or more time... 

Therefore with:

java -jar  plantuml.jar -preproc test_eval.pu

We obtains, test_eval.preproc:

@startuml

  !$r=1+2
  :$r;
@enduml

Then, we observe the expected result :

@PlantUML: 

• Could you allow, directly, or by parameter, the preprocessor to run more than one time [ideally until preproc_output(n + 1) == preproc_output(n)]?

Thanks for your works,
Regards,
Th.

---

FYI, wanted feature open here:

• https://forum.plantuml.net/14046/preprocessing-allow-the-preprocessor-run-more-than-one-time

Answer 1

Very good idea!

You can now have http://www.plantuml.com/plantuml/uml/SoWkIImgAStDuR9IJIrBpD5GCbJGLZ1IqhJciZAsvd98pKi1IW80

Is this what you were expecting ?

Comments

Hello,

Goods 

Is it possible to eval also Builtin functions, as:

@startuml
:3;
:%eval("1+2");
:%version();
:%eval("%version()");
@enduml

Regards,
Th.

---

Hello PlantUML,

Here is another test:

@startuml
!$a=1 + abc
:1 + abc = $a;

:1 + abc = %eval("1 + abc");

!$b="1 + abc"
:$b = %eval($b);
@enduml

Could you have a look?

Regards,
Th.